How can I use outliner dots(?? I don't know it's name)?
Mode toggling is a 2.91 feature. You need to update your Blender version.

Move mode toggling to the left column. When in non-object modes, icon buttons are shown in the left column for toggling modes. Clicking a dot icon will switch that object to become the new active object, Ctrl+click adds the object into the current mode. (2110af20f5)